I currently have my 4690k Oc'd to 4.0ghz and i am running a nvidia gtx 760. Was looking to possibly get a gtx 1060 but not sure if that would cause bottleneck issues. Any recommendations are helpful. Thank you

http://www.newegg.com/Product/Product.aspx?Item=N82E16814487275&ignorebbr=1

no bottleneck

Yeah you would be fine.
Wouldn't bottlenect a gtx 1080 either.

Pascal titan best gpu

no bottlenecking, 4690k would be able to serve even the 1080 or pascal titan

Thanks for the feedback, I ended up just going with the 1060 6b. Another questions I was wondering is it worth updating your bios? I currently have a GA-Z97MX-Gaming 5 running the F2 version which is the first release bios. I have zero problems with my PC currently but I wasn't sure if it was worth flashing and if do I do each version or only the latest? Once again any information given is greatly appreciated. Thank you

http://www.gigabyte.com/products/product-page.aspx?pid=4968#bios

if you have no issues with your current computer i wouldn't bother updating the bios unless there's a currently disabled feature that it enables, that you want